Hα-enhanced UV/IR blocking (HEUIB-II) Filter

Besides removing the
IR and UV ends of the spectrum which are often out of focus in
refractive optics, it isolates the common H-alpha line relative to the
surrounding extreme red end of the spectrum, making it easy to
bring out the faint H-alpha emission nebulosity of astronomical photos,
yet retain the background color balance of broadband photos.

Some filter comparison shots as well as customer results using the HEUIB-II
filter can be seen here:

Available in 52mm and 48mm sizes mounted in standard
camera filter rings, 37mm size mounted for the Canon MFA,
and unmounted in 36mm and 49mm sizes. The filter is also
available as a Nikon front filter.

Some comparison shots taken with the enhanced Canon 6DH (standard Canon UV/IR blocking filter vs. HEUIB-II filter)
show a clear difference both in background sky color balance and contrast of H-alpha nebulosity in the
extremely faint object IC1396.
Note the good background color balance as shown in the histograms of the individual color
channels of the HEUIB-II filtered image. Click on images to view enlargements.